Wirelessly Powered Backscatter Communications: Waveform Design and SNR-Energy Tradeoff

This letter shows that wirelessly powered backscatter communications is subject to a fundamental tradeoff between the harvested energy at the tag and the reliability of the backscatter communication, measured in terms of SNR at the reader. Assuming the RF transmit signal is a multisine waveform adap...

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Bibliographic Details
Published inIEEE communications letters Vol. 21; no. 10; pp. 2234 - 2237
Main Authors Clerckx, Bruno, Zawawi, Zati Bayani, Kaibin Huang
Format Journal Article
LanguageEnglish
Published IEEE 01.10.2017
Subjects
Antennas
Backscatter
Backscatter communications
Frequency diversity
Radio frequency
Signal to noise ratio
SNR-energy tradeoff
Transmitters
waveform design
Wireless communication
wireless power transfer
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ISSN1089-7798
DOI10.1109/LCOMM.2017.2716341

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Summary:This letter shows that wirelessly powered backscatter communications is subject to a fundamental tradeoff between the harvested energy at the tag and the reliability of the backscatter communication, measured in terms of SNR at the reader. Assuming the RF transmit signal is a multisine waveform adaptive to the channel state information, we derive a systematic approach to optimize the transmit waveform weights (amplitudes and phases) in order to enlarge as much as possible the SNR-energy region. Performance evaluations confirm the significant benefits of using multiple frequency components in the adaptive transmit multisine waveform to exploit the nonlinearity of the rectifier and a frequency diversity gain.
ISSN:1089-7798
DOI:10.1109/LCOMM.2017.2716341